CentOS7下安装JDK

<h3>1、获取server jre</h3> <p>建议从官网下载，安全有保障。</p> <h3>2、将jre上传到用户根目录。</h3> <p>利用xftp等工具上传server jre包</p> <h3>3、解压压缩包</h3> <pre><code class="language-bash">tar - zxvf server-jre-7u80-linux-x64.tar.gz</code></pre> <p>得到名称为<code>jdk1.7.0_80</code>的文件夹</p> <h3>4、建立/usr/local/java目录</h3> <pre><code class="language-bash">cd /usr/local sudo mkdir java</code></pre> <h3>5、将~/jdk1.7.0_21拷贝到/usr/local/java目录下</h3> <pre><code class="language-bash">sudo mv ~/jdk1.7.0_80 /usr/local/java</code></pre> <h3>6、进入/usr/local/java</h3> <pre><code class="language-bash">cd /usr/local/java </code></pre> <h3>7、将/usr/local/java下的所有文件的用户以及用户组修改为root</h3> <pre><code class="language-bash">sudo chown -R root . sudo chgrp -R root .</code></pre> <p>改为sudo chown -R easytong:easytong /usr/local/java</p> <h3>8、增加永久性系统环境变量</h3> <h4>1、获取root权限</h4> <pre><code class="language-bash">sudo su -</code></pre> <h4>2、编辑/etc/profile</h4> <pre><code class="language-bash">vi /etc/profile</code></pre> <h4>3、在/etc/profile最底部，增加如下命令：</h4> <pre><code class="language-bash">#Set Java Environment by TianShiMing on 2019.12.04 export JAVA_HOME=/usr/local/jdk1.7.0_80 #这里需要注意路径 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar</code></pre> <h4>4、保存退出</h4> <pre><code class="language-bash">esc :wq</code></pre> <h3>9、使环境变量生效</h3> <pre><code class="language-bash">source /etc/profile</code></pre> <h3>10、检测安装是否成功</h3> <pre><code class="language-bash">java -version javac -version</code></pre>